Implement the MediaPlayerElement control

[jeromelaban]

Implement the MediaPlayerElement, MediaPlayer, MediaPlayerSurface.

[baptiste-nv]

Work in progress, see https://github.com/nventive/Uno/tree/dev/bgy/video_player

[JohnGalt1717]

When can we expect captions (webvtt, srt etc.), playback speed and DRM to be available in mediaplayer? These are critical to virtually any serious application that would use video inside UNO. (and obviously web support too)

[jeromelaban]

@JohnGalt1717 Can you open an issue with those items ?

[JohnGalt1717]

#4636
#4637
#4638

Order of priority for me is DRM, Captions, Play back speed and the later is way down the list compared to the other 2 which are blockers.

Thanks!

[jeromelaban]

@JohnGalt1717 Thanks. I've compiled those issues in #4646 for better tracking.

[c10ms]

When can it be implemented on Linux platform? Raspberry Pi in my case, where video is used to show how an exercise is done as a primary form. It'll be highly appreciated if any progress or updates on this. Thanks!